One, Terry Hobson, told the Mail: “At first I thought someone had been bitten by a dog and it was on the loose- there was such a commotion.

“But then I saw the guy lying on the ground.

Forensic officers at the scene of the stabbing in Bartley Green (Image: Snappersk)

“It wasn’t until the paramedics arrived we realised he’d actually been stabbed in the chest.

“I went to resuscitate him but another girl took over and she was going at it for ages.

“But I don’t think he stood a chance.

A new picture of Alex Leonard, issued by West Midlands Police.

“He’d been stabbed in the chest.”

Detectives are still questioning a boy of 16 arrested soon after the incident along with an 18-year-old who was arrested on Wednesday on suspicion of murder.

A second man, aged 21, who was also arrested on suspicion of murder, was released without charge.

Det Insp Caroline Corfield, of West Midlands Police , said: “Investigations are continuing into the tragic death of Mr Leonard.

“I wish to express my gratitude to the local community who have been very supportive of this investigation.

“But I do believe there are still others who will have relevant information and would still like to hear from anyone who saw what happened and has not yet spoken to us and ask they get in touch as soon as possible.”

Anyone with information should call police on 101 or Crimestoppers, in confidence, on 0800 555 111.